Commutator assembling and finishing device.



pressure. The ring UNITED STATES PATENT OFFICE.

JOHN IVIOLES, OF ERIE, PENNSYLVANIA, ASSIGNOR TO TI-IE EUREKA COMPANY, OFb NORTI-I EAST, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

Specification of Letters Patent.

Patented Sept. 12, 1916.

Application led July 24, 1915. Serial No. 41,692.

T0 all whom it may concern Be it known that I, JOHN Moins, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented new and useful Im provenients in Commutator Assembling and Finishing Devices, of which the following is a specification.

This invention relates to commutator asseinbling and finishing devices and consists in certain improvements in the construction thereof as will be hereinafter fully described and pointed out in the claims.

T he invention is an improvement or carrying forward of the structure shown in the patent to John Risbridger dated May seth, i907, #855,134.. a

With the device as shown in the Risbridger patent difficulty developed in assembling the device and much time was lost in getting the device in proper position on the face plate. Again in reversing the commutator in finishing it difficulty was eX- perienced in retaining the assembled parts together.

The invention is illustrated in the accompanying drawings as follows Figure 1 shows a section of the parts with the radial end of the commutator out and so held on the face plate as to finish that part of the coinmiitator. Fig. 2 shows the same parts but with the commutator and the assembling device reversed. Fig. 3 shows a lan view of the parts as shown in Fig. 1.

1 marks the face plate and 2 the commutator bars. These cominutator bars are in the usual form, having the radial end 7. Arranged around the commutator bars is a contractible former 3 Ain the shape of a split ring, the line of separation being on a'slant as clearly shown in dotted lines in Figs. 1 and 2.

5 is a compression ring of sufficient mass and rigidity to maintain its shape under has a wedge or tapered opening 6 which engages the outer surface of the contractible former 3, the outer surface of the former being similarly shaped.

In practice the commutator barsare assembled, the contractible former put in place and the ring 5 forced on the former. In the final position of the ring 5, the face of the ring is flush with the face of the former so that both the former and the ring are against the rear shoulder of the radial end 7 In the first finishing of the comiiiutator bars the ring is arranged in the face plate as shown in Fig. 1 and the shoulder formed by the radial end holds the commutator bars against endwise movement under the pressure of the tools. In this operation the radial end 7 is faced. On reversing the parts on the face plate, the radial end 7 extends into a socket 8, the socket being of sufhcient diameter to more than take in the radial end 7. The socket, however, is made sufficiently shallow so that the face of the radial end will be brought into contact with the bottom 9 of the recess before the faccof the ring 5 engages the face of the plate so that the parts are trued by the face of the radial end on the bottom of the end.

In order to quickly center the ring 5 and consequently the commutator bars when released as well as in the preliminary cutting, I provide the socket 10 in the face plate, the diameter of this socket being exactly that of the ring 5. In this manner the commutator is as nearly centered as is possible in the rough and when the ring is reversed it is brought to exactly the same center so that no time whatever is lost in centering the parts. This with the fact that the parts are positioned as to face by the face of the radial 4end 7 which has been trued in the first operation assures centering and facing exactly in harmony with the two positions of the ring. A simple clamp may be used for securing the rings on the face plate, the clamps being shown at 11 and the clamp screws at 12.

What I claim as new is t- 1. In a commutator assembling and finishing' device, the combination of a compression ring of sufficient mass and rigidity to practically maintain its shape under ordinary use, and a contractible former adapted to engage commutator bars arranged in annular form, said contractible former being arranged withinl the compression ring', the former being comparatively flexible, said compression ring and former having engaging surfaces, the engaging surface of one of them having a varying diameter to compress the former by a relative movement of said surfaces in engagement, the former being flexed and its shape maintained approximately a true circle as it is compressed by the compression ring, the face of the compression ring being iiush with the face of the contractible former when in final posi? tion.

2. In a cominutator assembling and inishing device, the combination of a compression ring of suflicient mass and rigidity to practically maintain its shape under ordinary use; a contractible former adapted to enga-ge commutator bars arranged in annular form, said contractible former being comparatively flexible, said compression ring and former having engaging surfaces, the engaging surface of one of them having a varying diameter to compress the former by a relative movement of said surfaces in engagement, the former being flexed and its shape maintained approximately a true circle as it is compressed by the compression ring; a face plate having an annular concentric shoulder engaging one of the Walls of the compression ring; and means for securing the compression ring on the face plate.

3. In a commutator assembling and finishing device, the combination of a compression ring of sufficient mass and rigidity to practically maintain its shape under ordinary use, and a contractible former adapted to engage commutator bars arranged in annular form, said contractible former being arranged Within the compression ring, the former being comparatively flexible, said compression ring and former having engaging surfaces, the engaging surface of one of them having a varying diameter to compress the former by a relative movement of said surfaces in engagement, the former being flexed and its shape maintained approximately a true circle as it is compressed by the compression ring, the former being of an axial thickness not greater than the compression ring whereby the compression ring may be utilized for positioning the parts.

l. In a commutator assembling and finishing device, the combination of a compression ring of sufficient mass and rigidity to practically maintain its sha-pe under ordinary use; a contractible former adapted to Copies of this patent may be obtained for jive cents each, by addressing the Commissioner enga-ge commutator bars arranged in annular form, said contractible former being arranged Within the compression ring, the former being comparatively flexible, said compression ring and former having engaging surfaces, the engaging surface of one of them having a varying diameter to compress the former by a relative movement of said surfaces in engagement, the former being flexed and its shape maintained approximately a true circle as it is compressed by the compression ring, the former being of less axial thickness than the compression ring whereby the compression ring may be utilized for positioning the parts; and a face plate having an annular concentric shoulder engaging one of the Walls of the compression ring.

5. In a commutator assembling and finishing device, the combination of a compression ring of sufficient mass and rigidity to practically maintain its shape under ordinary use; a contractible former adapted to engage commutator bars arranged in annular form, said contractible former being arranged Within the compression ring, the former being comparatively flexible, said compression ring and former having engaging surfaces,

the engaging surface of one of them havingl a varying diameter to compress the former by a relative movement of said' surfaces in engagement, the former being flexed and its shape maintained approximately a true circle as it is compressed by the compression ring; a face plate having a socket of a diameter to engage the outer periphery of the compression ring to center the same, said socket having its bottom faced to engage the face of the radial end of a commutator held by the former; and means for clamping the compression ring on the face plate.

In testimony whereof I have hereunto set my hand in the presence of two subscribing Witnesses.

. JOHN MOLES. fitnessesz B. M. I-IARTMAN, THOMAS C. MILLER.

of Patents,

Washington, D. C. 

